ASYMMETRICAL LIGHT-TURNING FEATURES

摘要

This disclosure provides systems, methods and apparatus for light-guiding layers including asymmetrical light-turning features. In one aspect, the asymmetrical light-turning features may include a leading edge oriented at an angle which turns light out of the light-guiding layer, and a near-vertical trailing edge which reduces light leakage from the light-guiding layer. In another aspect, the asymmetrical light-turning features of the light-guiding layer may be oriented in the same or similar direction, and may be distributed with decreasing density adjacent a light source to provide more even illumination.

主权项

1. A light-turning structure comprising:
a substrate including a first generally planar surface and a second generally planar surface; and a plurality of depressions in the shape of asymmetrical frusta formed in the first surface of the substrate, each of the plurality of depressions having an angled sidewall including:
a leading edge forming a first angle relative to a normal of the first surface and configured to reflect a portion of incident light out of the substrate, anda trailing edge forming a second angle relative to the normal of the first surface, wherein the first angle is substantially larger than the second angle.